io.netty.channel.epoll.UnixChannelUtil Maven / Gradle / Ivy
/*
* Copyright 2017 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.channel.epoll;
import io.netty.buffer.ByteBuf;
import io.netty.util.internal.PlatformDependent;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
public final class UnixChannelUtil {
private UnixChannelUtil() {
}
/**
* Checks if the specified buffer has memory address or is composed of n(n <= IOV_MAX) NIO direct buffers.
* (We check this because otherwise we need to make it a new direct buffer.)
*/
public static boolean isBufferCopyNeededForWrite(ByteBuf byteBuf) {
return isBufferCopyNeededForWrite(byteBuf, Native.IOV_MAX);
}
static boolean isBufferCopyNeededForWrite(ByteBuf byteBuf, int iovMax) {
return !byteBuf.hasMemoryAddress() && (!byteBuf.isDirect() || byteBuf.nioBufferCount() > iovMax);
}
public static InetSocketAddress computeRemoteAddr(InetSocketAddress remoteAddr, InetSocketAddress osRemoteAddr) {
if (osRemoteAddr != null) {
if (PlatformDependent.javaVersion() >= 7) {
try {
// Only try to construct a new InetSocketAddress if we using java >= 7 as getHostString() does not
// exists in earlier releases and so the retrieval of the hostname could block the EventLoop if a
// reverse lookup would be needed.
return new InetSocketAddress(InetAddress.getByAddress(remoteAddr.getHostString(),
osRemoteAddr.getAddress().getAddress()),
osRemoteAddr.getPort());
} catch (UnknownHostException ignore) {
// Should never happen but fallback to osRemoteAddr anyway.
}
}
return osRemoteAddr;
}
return remoteAddr;
}
}